#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
    int n = 0;
	int i = 0;
	int j = 0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
	    for(j=0;j<n;j++)
		{
		    if(i == 0 || i == n-1 || j == 0 || j == n-1)
			{
			    printf("* ");
			}
			else
			{
			    printf("  ");
			}
		}
		printf("\n");
	}
	return 0;
}

